USPTO Patents Application 10646860

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[Translation]

LAID-OPEN PATENT APPLICATION

Laid-open patent application number: Hei-6-18777

Date laid-open: January 28, 1994

Int. CI.
G02B 7/73 7/09
G03B 13/36

Classification mark / Office filing number: FI

9119-2K
G02B 7/11 B ;
7/04 A

Examination requested: Yes'
Number of patent claim: 1
(4 pages)
[Continued to last page]

Patent application number: Hei-5-65210
Indication of division: Division of Sho-61-66553
Date of application: March 24, 1986

Applicant: Nikon Inc., No. 2-3, 3-chome, Marunouchi, Chiyoda-ku,

Tokyo

Name of inventor: 0. Wakabayashi, c/o Oi Factory, Nihon Kogaku
KogyoKabushikiKaisha, No. 6-3, 1-chome, Nishi-Oi, Shinagawa-ku,

Tokyo

Name of inventor: H. Miyamoto, c/o Oi Factory, Nihon Kogaku Kogyo
Kabushiki Kaisha, No. 6-3, 1-chome, Nishi-Oi, Shinagawa-ku,

Tokyo

Representative: F. Nagai, patent attorney

[TITLE OF INVENTION] CAMERA
[SUJMMARY]

[Object] It is tlie object of tlie invention to miniaturize camera
body by securing inside lens barrel a space necessary for
containing parts to be contained inside lens barrel while
preventing lens barrel from becoming larger.

[Construction] In a camera liaving a lens barrel 9 capable of
advancing and retreating along the optical axis of the
photographic lens 1, the central axis extending toward the .
advancing and retreating direction of the lens barrel 9 is
decentered in respect of the optical axis of the photographic
lens 1. Parts to be contained inside the lens barrel such as
the distance metering optical system 30 are contained in the
space expanded as result of decentering.

32 . ■ .

Condenser lens

34

Projector lens

9

Lens' barrel

[PATENT CLAIM]

(Claim 1] A camera having a lens barrel capable of advancing
and retreating along the 'optical axis of a photographic lens,
wherein the central axis extending toward the advancing and
retreating direction of the lens barrel is decentered in respect
of the optical axis of the photographic lens.

[Detailed explanation of the invention]
[0001]

[Industrial application of the invention] The present invention
relates to a camera having a lens barrel capable of advancing
and retreating to the direction of the optical axis of the
photographic lens . " .
[0002]

[Conventional technology] In a conventional camera of this type,
a variable focus camera is known wherein the focal length of
the photographic lens is changed by changing the extent of
extension of the lens barrel in respect of the camera body. In
such a variable focus camera, it is so arranged as to make the
optical axis of the photographic lens coincide with the central
axis of the lens barrel, and parts to be contained inside the
lens barrel, such as a diaphragm/shutter or an actuator for focus
adjusting mechanism, are contained in the spacing between the
outer periphery of the photographic lens and the inner periphery
of, the lens barrel.
[0003]

[Problems which the present invention intends to solve] In the
above-mentioned type of camera, the diameter of the lens barrel
has to be made larger in order to expand the space to contain
parts to be contained inside the lens barrel; however, the parts
to be contained inside the lens barrel are arranged only at a
specific position on the outer periphery of the photographic
lens; and accordingly, the diameter of the lens barrel has to
be made larger only for some parts to be contained inside the
lens barrel, and this creates aa unnecessary space af positions

where parts to be contained inside the lens barrel are not to
be contained. As the lens barrel becomes larger, the enlargement
of the drive mechanism for advancing and retreating it to the
direction of the optical axis of the photographic lens can not
be prevented, and this becomes a great obstacle for making camera
body compact.

[0004.] It is the object of the present invention to provide a
camera wherein the camera body can be made compact by securing
inside lens barrel a space necessary for containing parts to
be contained inside lens barrel while preventing lens barrel
from becoming larger.
[0005]

' [Means to solve problems] Explanation will now be made in
reference to Fig. 1 showing an exair¥>le of embodiment. The present
invention is applied to a camera having a lens barrel 9 capable
of advancing and retreating along the optical axis of the
photographic lens 1. And the above-mentioned object can be
achieved by decentering the central axis extending to the
advancing and retreating direction of the lens barrel 9 in
respect of the optical axis of the photographic lens 1.
[0006]

[Operation] A large space suitable for containing the parts 30
to be contained inside the lens barrel can be provided on the
side of the .decentered direction of the central axis of the- lens
barrel 9 without enlarging the lens barrel 9.
[0007] incidentally, in the foregoing paragraphs (Means to solve
problems and Operation) , an illustration of an embodiment is
shown in order to facilitate understanding of the present,
invention; however, the present invention is -not thereby
restricted to such example of embodiment.
[0008]

[Example of embodiment] Explanation will now be made, of one
example of embodiment of the present invention by referring to
Fig. 1 to Fig. 4. Fig. 1 to Fig. 4 show one embodiment of the
present invention. In Fig. 1 showing a vertical section of the

lens barrel portion, the principal lens 1 made of 3 groups is
retained by a retainer barrel 3 wherein a helicoid screw 3a is
provided/carved on the outer peripheral part thereof, and the
retainer barrel 3 is screwed to the helicoid 51 of the shutter
baseboard 5. The shutter baseboard 5 retains the shutter 7 at
the rear part 52 of the principal lens 1, and the distance
metering" optical system 30 to be referred to later is arranged
in the retainer member 53 at the upward portion of the principal
lens 1. .

[0009] Inside the tubular shaped lens barrel 9/ the shutter
baseboard 5 is fixed in unison therewith, and the helicoid screw
91 which is provided/ carved on the outer periphery of the lens
barrel 9 meshes with the helicoid screw 111 of the lens barrel
transport tube 11 arranged on the outer periphery of the lens
barrel 9. The rotation'of the lens barrel 9 itself is prevented
by a rotation prevention member provided on the camera body (not
illustrated) , while its movement to the direction of the. optical
axis is made f ree^ and consequently^ as the lens barrel transport
tube 11 rotates, the lens barrel 9 moves along the optical axis
in association therewith. In other words, movement takes place
between the retreated position in short focal length
photographic mode (Fig. 1) and the extended position in long
focal length photographic mode (Fig. 2). Incidentally, 10 shows
a cover.

[0010] There is also provided a coupler ring 13, rotationally
movable around the optical axis of the principal lens 1, on the
outside of the tubular part 54 of the shutter baseboard 5 on
which the retainer barrel 3. is screwed. As- shown in Fig. 4, a-
motor 15 having a gear 151 meshing with the gear 131 formed on
the coupler ring 13 is retained by the shutter baseboard 5.
Furthermore, a tubular cam 132 is provided on and in association
with the coupler ring 13.

[0011] In Fig. 4, the cam follower 171 of the lever 17, made
rotationally movable around the rotation center 01 is engaged
with the cam 132. At the other end of the lever 17, there is

provided a pin 172 which made to engage with the engagement part
191 of the lever 19 made ro. tatidnally movable around the
rotation center 02. Here, the coupler ring 13, motor 15, levers
17 and 19 comprise a scanning means 40. Also, the coupler ring
13 has an engagement arm 133 provided in protrusion to the forward
direction of the camera, and as shown in Fig. 3, it engages with
the engagement arm 211 of the back adjustment ring 21 screwed
onto the front plane '3b of the retainer barrel 3, and the rotation
of the motor 15 is conveyed to the retainer barrel 3 via the
coupler ring 13. The coupler ring 13, motor 15, and back
adjustment ring 21 comprise the drive means 50 of the
photographic optical system.

[0012] As illustrated in Fig. 1 and Fig. 4, the distance metering
optical system 30 is comprised of a light receptor -sensor 31
fixed on and retained by the shutter baseboard 5, a condenser
lens 32 which condenses reflected light onto the light receptor
sensor 31 as will.be explained later, a light emitter element

33 fixed onto, one end of the lever 19 and a projector lens 34
which projects the exit light from the light emitter element

• 33 to the direction of a photographic object. As shown in Fig.

3, the condenser lens 32 and the projector lens 34 have a pair
of cutouts 32a and 34a on the periphery thereof respectively
in parallel . Installation of these cutouts 32a and 34a is helpful

• in making the retainer member 53 small and enlargement 6f the
diameter of the lens barrel 9 is thereby restrained. In Fig.

4, incidentally, the condenser lens 32 and the projector lens

34 are illustrated in a round shape for sake of simplification.
[0013] Also, as will be clear from Fig . 1 and Fig. 3, the principal
lens 1 is mounted with its optical axis downwardly decentered
from the central axis of the lens barrel 9. This is helpful in
expanding the space for containing the distance metering optical
system 30 while preventing increase of the diameter of the lens
barrel 9. And the lighf receptor sensor 31 and the light emitter
element 33 are connected to the autoihatic focus detection circuit
41, the _light. emitter element 33 is so controlled as to emit

modulated light and distance metering is performed according
to the output signal of the light receptor sensor 31.
This detection circuit 41 is connected to the computation
processing unit 42 (referred to as "CPU" hereunder): which is
connected to the motor -drive circuit 4 3 for controlling the motor
15. Incidentally, the electrical elements of this detection
circuit 41, CPU 42, and motor drive circuit 43 are also retained
in unison on the shutter baseboard 5.

[0014] The operation of the embodiment thus constructed will
now be explained. In short focal length photography, as shown
in Fig, 1/ the lens barrel 9 is in its recessed position inside
the lens barrel transport tube 11, and the focal length is
determined by the principal lens 1- As the shutter button {not
illustrated) is half -depressed, the motor drive circuit 43
starts working according to a. command from the CPU 42, the motor
15 starts its rotation and the light .emitter element 33 emits
modulated light by way of the detection circuit 41. In. Fig. 4,
as the motor 15 rotates to the counterclockwise. direction, the
coupler ring 13 rotates to the clockwise direction and the lever
17 rotates to the counterclockwise direction. As the lever 19
rotationally moves to the clockwise direction in association
with the lever 17", the light emitter element 33 also rotationally
moves to the clockwise direction, and the photographic object
is scanned with modulated light via the light projector lens
3.4. And the- rotation of the motor 15 is conveyed to the back
adjustment ring 21 via the engagement arms 133 and 211, the
retainer barrel 3 rotates and this' causes the principal lens
1 to be extended against the shutter baseboard 5.
[0015] The modulated light projected onto the photographic
object is reflected and enters the bi-sectional light receptor
sensor 31 via the condenser lens 32. The output from each of
the pair of light receptor sensor 31 enters the detection circuit
41, where the signal is processed according to a known method,
and the -point where the output from each of the light .receptor
sensor 31 coincides is judg-ed as an in-focus point and a judgment

signal is output to the CPU 42. Thereafter, a motor stop signal
is output from the CPU to the motor drive circuit 43 and the
motor 15 is stopped. Thus, the extension of the retainer barrel

■ 3 is stopped and the principal lens 1 is controlled and comes
into focus according to the distance to the photographic object.
[0016] In succession, according to a drive means (not
illustrated) , the lens barrel transport tube 11 with the rotating
lens barrel 9 is extended to the camera/ s forward direction aloag
the optical axis, a secondary lens 23 is inserted to the rear
optical axis of the principal lens 1, thus enabling long focal
length photography as illustrated in Fig. 2. As is clear from
Fig.. 2/ the drive means 50, coirprising the principal, lens 1
comprising the photographic optical system, the. distance
metering optical system 30, the scanning means 40 and the motor
15, moves forward in unison, in association with the extension
of the lens barrel 9, and hence the relative positional
relationship among these elements and systems do not change.
In long .focal length photography, also, distance metering and
focus adjustment are likewise performed as in short focal length
photography. In either case of short focal length photography
or long focal length photography, it is so optically designed
that the amount of extension of the principal lens 1 remains

.the same in respect of the distance of photography- Consequently,
the same cam can be used.

[0017] As has been explained above, according to this embodiment,
a necessary space for containing the distance metering optical
system 30 is secured inside the lens barrel 9 by decentering
the lens barrel 9, the lens barrel can be made compact, in-
comparison with the conventional example where the lens barrel
■•9 and the principal lens 1 are brought onto the same axis. As
a result of this, the mechanism for advancing and retreating
the lens barrel 9 to the direction of the optical axis of the.
principal lens 1 can also be made compact, and this further makes
it possible to make camera body compact.

■[0018] According to this embodiment, the distance metering

optical system 30 is contained in the space which is expanded
in- association with the decentering of the optical axis of the
principal lens 1 from the central axis of the lens barrel 9;
however, the present invention is not restricted to this
embodiment. In case where the distance metering optical system
30 is not to be contained inside the lens barrel 9, other parts
to be contained inside the lens barrel, such as tge shutter
baseboard 5 for example, may be contained . inside the space
expanded as result of decentering. The present invention can
be applied not only in a bifocal length camera, but in a
single-focal length camera or three- or more focal length camera,
as long as the lens barrel advances and retreats.
[0019]

[Benefits of invention] According to the present invention, as
has been explained so far, the central axis of the lens barrel
is decentered in respect of the optical axis of the photographic
lens, and consequently the camera body can be made compact by ■
securing inside lens barrel a space necessary for containing
parts to be contained inside lens barrel while preventing lens
barrel from becoming larger.
[Brief explanation of the drawings]

[Fig. 1] Vertical sectional drawing- of the front part of the
lens barrel in short focal length mode in a camera in one example
of embodiment of the present invention.

[Fig. 2] Vertical sectional drawing of the front part of the
lens barrel in long focal length mode in a camera in one example
of embodiment of the present invention.
[Fig. 3] From view of Fig; 1 seen from the line III-III.
[Fig. 4] Drawing of the periphery of the distance metering •
optical system 30, including a block diagram of the focal length-
detection control system.
[Explanation of the reference marks]
1 Principal lens ,

3 Retainer barrel

5 Shutter baseboard

9 Lens ' barrel

11 Lens barrel transport tube

13 Coupler ring

21 Back adjustment ring

30 Distance metering optical system

31 Light emitter element
33 Light receptor sensor
4 0 Canning means

50 Drive means

[Fig. 1]
11

Lens barrel transport tube
9

Lens* barrel
30

Distance metering optical system
31 (33)

Light- receptor sensor
Light emitter element

40 .
Scanning means

1 ■ ■ .

Principal lens (photographic optical system)

3

Retainer barrel

13

Coupler ring
5

Shutter baseboard
21

Back adjustment ring
50

Drive means

[Fig. 2]
23

Secondary lens

[Fig. 3]
32

Condenser lens
34

Projector lens
9

Lens barrel

[Fig. 4]
41 •

Detection circuit

43

Motor drive circuit

Continued from front page:

Intl. CI.
Identification mark

Off:ice filing number FI
7316-2K G03B 3/00

Fig.1

Lens barrel transport tu"Be 11

Lens barrel
Distance metering optical system 3^^-^^

Scanning means L^%'

^0 17|"

Coupler ring
Shutter baseboards

31(33): Light receptor sensdr
Light emitter element

32(34)

^/Principal lens (Photographic optical system)

Retainer barrel

b

Back adjustment ring
50 Drive means

Fig.2

it qi

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